Add comprehensive benchmarking framework for DTail

- Create benchmark framework to measure performance of dcat, dgrep, and dmap
- Generate test files of 10MB, 100MB, and 1GB with configurable patterns
- Support benchmarking with gzip and zstd compressed files
- Implement tool-specific benchmarks:
  * DCat: Simple reading, multiple files, compressed files
  * DGrep: Pattern matching, regex complexity, context lines, inverted grep
  * DMap: Aggregations, group by operations, complex queries, time intervals
- Track performance metrics: throughput (MB/sec), lines/sec, memory usage
- Save results in multiple formats: JSON, CSV, and Markdown reports
- Add Makefile targets: benchmark, benchmark-quick, benchmark-full
- Support environment variables for configuration (sizes, timeouts, etc.)
- Automatically clean up temporary .tmp files after benchmarks

The framework provides consistent performance testing across the DTail toolset
and enables tracking performance regressions between commits.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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